function sure(key) {
	var bt1 = document.getElementById('page1');
	var bt2 = document.getElementById('page2');
	var bt3 = document.getElementById('page3');
	var bt4 = document.getElementById('page4');
	bt1.style.backgroundColor = "";
	bt2.style.backgroundColor = "";
	bt3.style.backgroundColor = "";
	bt4.style.backgroundColor = "";
	
	if(key == 1) {
		bt1.style.backgroundColor = "#ef4238";
	} else if(key == 2) {
		bt2.style.backgroundColor = "#ef4238";
	} else if(key == 3) {
		bt3.style.backgroundColor = "#ef4238";
	} else if(key == 4) {
		bt4.style.backgroundColor = "#ef4238";
	}
	
	
}



